medium · GMAT Verbal
A study found that employees who use standing desks report less back pain than employees who use seated desks. A researcher concludes that standing desks cause the reduction in back pain.
Which of the following, if true, most weakens the researcher's conclusion?
- Employees who choose standing desks also exercise more, and exercise independently reduces back pain.
- The association between standing-desk use and lower back pain was statistically significant.
- The participants in the study were randomly selected from the population.
- The study followed employees continuously over a span of ten years.
- No earlier study found an association between desk type and back pain as strong as this one.
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